Varian 948, Operation And Service Manual

Page: 151 / 176

Models 947, 948 and 960 Leak Detectors Operations and Service Manual
C-7
Table C-4 lists the commands used to cause leak detection actions.
Table C-4 Command Parameters for Leak Detection Actions
Command Action
CALIBRATE Adjusts the Ion source parameters to cause a maximum response to helium,
then adjusts the gain so that the current helium signal is the same as most
recently input using INIT-STDLEAK. Success is indicated by a yes response to
?CALOK<CR>. With PARALLEL ENABLE asserted, the response is cant.
DISABLE-RANGESTOP Causes range limiting to cease operation. No parameters.
DISABLE-SEQUENCER Causes the auto-sequencer to cease operation. No parameters.
ENABLE-RANGESTOP Causes range limiting to begin operation. No parameters.
ENABLE-SEQUENCER Causes the auto-sequencer to begin operation. No parameters.
FPEAK Adjusts the variable focus Ion Source parameter to cause a maximum response
to helium. With PARALLEL ENABLE asserted, the response is cant.
KEEP Causes the leak detector to close most valves and enter the HOLD state.
No parameters.
ROUGH Causes the leak detector to begin a roughing and testing sequence.
No parameters.
SYTCATM Sets the current system thermocouple reading to represent atmospheric
pressure. Success is indicated by the normal ok response.
SYTCZERO Sets the current system thermocouple reading to represent a pressure that is
too low for a thermocouple to read. Success is indicated by the normal ok
response.
TPTCATM Sets the current test port thermocouple reading to represent atmospheric
pressure. Success is indicated by the normal ok response.
TPTCZERO Sets the current test port thermocouple reading to represent a pressure that is
too low for a thermocouple to read. Success is indicated by the normal ok
response.
TUNE Adjusts Ion voltage to cause a maximum response to helium. With PARALLEL
ENABLE asserted, the response is cant.
VENT Causes the leak detector to vent the test port to atmosphere. No parameters.
ZERO Sets the current leak rate measurement to be 0.00 atm cc/sec. Success is
indicated by the normal ok response. With the PARALLEL ENABLE asserted,
the response is cant.